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lines can render more than 65k vertices (resolves issue #1356).

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This commit is contained in:
Alex Szpakowski
2019-09-28 18:34:56 -03:00
parent 157282ec7e
commit ed537c4f6a
2 changed files with 63 additions and 39 deletions
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src/modules/graphics/Polyline.cpp
+50 -26
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@@ -367,39 +367,63 @@ Polyline::~Polyline()
void Polyline::draw(love::graphics::Graphics *gfx)
{
int total_vertex_count = (int) vertex_count;
if (overdraw)
total_vertex_count = (int) (overdraw_vertex_start + overdraw_vertex_count);
const Matrix4 &t = gfx->getTransform();
bool is2D = t.isAffine2DTransform();
Graphics::StreamDrawCommand cmd;
cmd.formats[0] = vertex::getSinglePositionFormat(is2D);
cmd.formats[1] = vertex::CommonFormat::RGBAub;
cmd.indexMode = triangle_mode;
cmd.vertexCount = total_vertex_count;
Graphics::StreamVertexData data = gfx->requestStreamDraw(cmd);
if (is2D)
t.transformXY((Vector2 *) data.stream[0], vertices, total_vertex_count);
else
t.transformXY0((Vector3 *) data.stream[0], vertices, total_vertex_count);
Color32 curcolor = toColor32(gfx->getColor());
Color32 *colordata = (Color32 *) data.stream[1];
for (int i = 0; i < (int) vertex_count; i++)
colordata[i] = curcolor;
int overdraw_start = (int) overdraw_vertex_start;
int overdraw_count = (int) overdraw_vertex_count;
int total_vertex_count = (int) vertex_count;
if (overdraw)
fill_color_array(curcolor, colordata + overdraw_vertex_start);
total_vertex_count = overdraw_start + overdraw_count;
// love's automatic batching can only deal with < 65k vertices per draw.
// uint16_max - 3 is evenly divisible by 6 (needed for quads mode).
int maxvertices = LOVE_UINT16_MAX - 3;
int advance = maxvertices;
if (triangle_mode == vertex::TriangleIndexMode::STRIP)
advance -= 2;
for (int vertex_start = 0; vertex_start < total_vertex_count; vertex_start += advance)
{
const Vector2 *verts = vertices + vertex_start;
Graphics::StreamDrawCommand cmd;
cmd.formats[0] = vertex::getSinglePositionFormat(is2D);
cmd.formats[1] = vertex::CommonFormat::RGBAub;
cmd.indexMode = triangle_mode;
cmd.vertexCount = std::min(maxvertices, total_vertex_count - vertex_start);
Graphics::StreamVertexData data = gfx->requestStreamDraw(cmd);
if (is2D)
t.transformXY((Vector2 *) data.stream[0], verts, cmd.vertexCount);
else
t.transformXY0((Vector3 *) data.stream[0], verts, cmd.vertexCount);
Color32 *colordata = (Color32 *) data.stream[1];
// Constant vertex color up to the overdraw vertices.
for (int i = 0; i < std::min(cmd.vertexCount, (int) vertex_count - vertex_start); i++)
colordata[i] = curcolor;
int colorcount = 0;
if (overdraw)
colorcount = std::min(cmd.vertexCount, overdraw_count - (vertex_start - overdraw_start));
if (colorcount > 0)
{
Color32 *colors = colordata + std::max(0, (overdraw_start - vertex_start));
fill_color_array(curcolor, colors, colorcount);
}
}
}
void Polyline::fill_color_array(Color32 constant_color, Color32 *colors)
void Polyline::fill_color_array(Color32 constant_color, Color32 *colors, int count)
{
for (size_t i = 0; i < overdraw_vertex_count; ++i)
for (int i = 0; i < count; ++i)
{
Color32 c = constant_color;
c.a *= (i+1) % 2; // avoids branching. equiv to if (i%2 == 1) c.a = 0;
@@ -407,9 +431,9 @@ void Polyline::fill_color_array(Color32 constant_color, Color32 *colors)
}
}
void NoneJoinPolyline::fill_color_array(Color32 constant_color, Color32 *colors)
void NoneJoinPolyline::fill_color_array(Color32 constant_color, Color32 *colors, int count)
{
for (size_t i = 0; i < overdraw_vertex_count; ++i)
for (int i = 0; i < count; ++i)
{
Color32 c = constant_color;
c.a *= (i & 3) < 2; // if (i % 4 == 2 || i % 4 == 3) c.a = 0